Source for programmable unijunction transistors?

[[email protected]]

Where would I buy a few dozen PUT's? If Mouser or Digi-Key stocks
them, I am too dumb to be able to find the part number. Thanks in
advance!

Alice Parker alice atsign nancy1234 dot com

 

[Tim Shoppa]

Where would I buy a few dozen PUT's?  If Mouser or Digi-Key stocks
them, I am too dumb to be able to find the part number.  Thanks in
advance!

2N6027/6028 is the current generation of parts and available from
Mouser, Digikey, etc.

2N4870/4871 and 2N2646/2647's are previous generations (but still
available from Newark, etc.)

Tim.

 

[Spehro Pefhany]

2N6027/6028 is the current generation of parts and available from
Mouser, Digikey, etc.

2N4870/4871 and 2N2646/2647's are previous generations (but still
available from Newark, etc.)

Tim.

2N4870/1 are not PUTs, they're UJTs. There was an even older one that
was popular, but I can't remember the part number.. 2N6246? Ah,
2N2646. UJTs have a chunk of intrinsic Silicon between the two bases,
wheras the PUTs are essentially an upside-down SCR. The application
circuits are almost the same except the PUT needs two resistors to set
the trigger point (and the parallel resistance of the two resistors
sets the valley current).

Best regards,
Spehro Pefhany

 

[Leon]

2N4870/1 are not PUTs, they're UJTs. There was an even older one that
was popular, but I can't remember the part number.. 2N6246? Ah,
2N2646. UJTs have a chunk of intrinsic Silicon between the two bases,
wheras the PUTs are essentially an upside-down SCR. The application
circuits are almost the same except the PUT needs two resistors to set
the trigger point (and the parallel resistance of the two resistors
sets the valley current).

Best regards,
Spehro Pefhany

Many years ago I needed a UJT when they had just been invented and I
couldn't buy one, so I simulated one with an NPN and PNP transistor.
It might be possible to do the same for a PUT.

Leon

 

[[email protected]]

Where would I buy a few dozen PUT's? If Mouser or Digi-Key stocks
them, I am too dumb to be able to find the part number. Thanks in
advance!

Alice Parker alice atsign nancy1234 dot com

<blink> <blink>
People still use those? Hey cool. Check out the Wiki
http://en.wikipedia.org/wiki/Unijunction_transistor

Part numbers to give you a start.
Wow, I haven't heard about these in decades. I had fun with UJTs
though, used them to build a strobe light. The UJT was in a relaxation
oscillator to trigger the xenon tube.

 

[legg]

Where would I buy a few dozen PUT's? If Mouser or Digi-Key stocks
them, I am too dumb to be able to find the part number. Thanks in
advance!

Alice Parker alice atsign nancy1234 dot com

Pro-electron part numbers

BRY61
BSV58

Jedec

2N6027
2N6028

RL